>Inb4 "Erm, akshully you Christcuck, the word is probably from some pagan root in German."
No, the Anglo-Saxons took it from old and Christianized Germanic tribes and kingdoms, who themselves took it from the Greek Κυριακόν δομα (kyriakon doma) "house of the Lord", κύριος (kyrios) being another name for Jesus Christ.
https://www.etymonline.com/search?q=church